71811 ACD/HCP4
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71811 ACD/HCP4
Basic Information
System of measurement
Metric
Weight
0.073 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.007mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
29
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2151 lbf
Radial static load rating
2295 lbf
Limiting speed
30 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 502.51
/ each
In Stock
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71811 ACD/HCP4 Bearing Product Overview & Core Advantages
The 71811 ACD/HCP4 is a single-row angular contact ball bearing engineered for applications demanding high precision and superior speed performance. Designed to accommodate primarily axial loads in one direction, combined with moderate radial loads, this bearing features a 25° contact angle optimized for high rigidity. Manufactured to P4 (ABEC-7) tolerance class, it ensures exceptional running accuracy. The combination of a ceramic ball material and phenolic cage enables operation at limiting speeds up to 30,000 rpm, making it an ideal solution for high-speed spindles and precision machinery.
71811 ACD/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
The model designation 71811 ACD/HCP4 can be broken down as follows:
- 71811: Basic bearing series, indicating a light series, single-row angular contact design with specific bore diameter (55 mm), outside diameter (72 mm), and width (9 mm).
- ACD: Designates a 25° contact angle and that the bearing is supplied with a specific preload for immediate high-rigidity performance.
- HCP4: A composite suffix where:
- HC: Indicates the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4: Specifies the tolerance class (P4/ABEC-7), denoting very high precision.
71811 ACD/HCP4 Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds.
- High-Speed Phenolic Cage: The phenolic resin cage offers excellent dimensional stability with low weight, contributing to the bearing's high limiting speed and smooth operation under high acceleration.
- Precision & Rigidity: The 25° contact angle and factory-set preload provide high axial rigidity and precise rotational accuracy, critical for applications like machine tool spindles.
- Superior Load Capacity: With a dynamic load rating of 2151 lbf and a static load rating of 2295 lbf, it reliably handles combined loads.
- Pre-Lubricated & Open Design: The open seal type allows for optimal lubrication management, while the bearing is supplied lubricated for immediate use within a temperature range of -30°C to 110°C.
71811 ACD/HCP4 Bearing Typical Application Areas
The 71811 ACD/HCP4 is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors
- Turbocharger Systems
- Advanced Aerospace & Defense Systems
